diff --git a/src/Capacity/All.php b/src/Capacity/All.php
index 57881e1..d1fd509 100644
--- a/src/Capacity/All.php
+++ b/src/Capacity/All.php
@@ -11,16 +11,13 @@
 
 use function Kiboko\Component\SatelliteToolbox\Configuration\compileValueWhenExpression;
 
-final class All implements CapacityInterface
+final readonly class All implements CapacityInterface
 {
-    public function __construct(private readonly ExpressionLanguage $interpreter) {}
+    public function __construct(private ExpressionLanguage $interpreter) {}
 
     public function applies(array $config): bool
     {
-        $endpoints = array_merge(
-            Sylius\Validator\ExtractorConfigurationValidator::ADMIN_VALID_TYPES,
-            Sylius\Validator\ExtractorConfigurationValidator::SHOP_VALID_TYPES,
-        );
+        $endpoints = [...Sylius\Validator\ExtractorConfigurationValidator::ADMIN_VALID_TYPES, ...Sylius\Validator\ExtractorConfigurationValidator::SHOP_VALID_TYPES];
 
         return isset($config['type'])
             && \array_key_exists($config['type'], $endpoints)
diff --git a/src/Capacity/Create.php b/src/Capacity/Create.php
index d3b314b..0626939 100644
--- a/src/Capacity/Create.php
+++ b/src/Capacity/Create.php
@@ -13,10 +13,7 @@ final class Create implements CapacityInterface
 {
     public function applies(array $config): bool
     {
-        $endpoints = array_merge(
-            Sylius\Validator\ExtractorConfigurationValidator::ADMIN_VALID_TYPES,
-            Sylius\Validator\ExtractorConfigurationValidator::SHOP_VALID_TYPES,
-        );
+        $endpoints = [...Sylius\Validator\ExtractorConfigurationValidator::ADMIN_VALID_TYPES, ...Sylius\Validator\ExtractorConfigurationValidator::SHOP_VALID_TYPES];
 
         return isset($config['type'])
             && \array_key_exists($config['type'], $endpoints)
diff --git a/src/Capacity/ListPerPage.php b/src/Capacity/ListPerPage.php
index 3ab8dc4..ec13d11 100644
--- a/src/Capacity/ListPerPage.php
+++ b/src/Capacity/ListPerPage.php
@@ -11,16 +11,13 @@
 
 use function Kiboko\Component\SatelliteToolbox\Configuration\compileValue;
 
-final class ListPerPage implements CapacityInterface
+final readonly class ListPerPage implements CapacityInterface
 {
-    public function __construct(private readonly ExpressionLanguage $interpreter) {}
+    public function __construct(private ExpressionLanguage $interpreter) {}
 
     public function applies(array $config): bool
     {
-        $endpoints = array_merge(
-            Sylius\Validator\ExtractorConfigurationValidator::ADMIN_VALID_TYPES,
-            Sylius\Validator\ExtractorConfigurationValidator::SHOP_VALID_TYPES,
-        );
+        $endpoints = [...Sylius\Validator\ExtractorConfigurationValidator::ADMIN_VALID_TYPES, ...Sylius\Validator\ExtractorConfigurationValidator::SHOP_VALID_TYPES];
 
         return isset($config['type'])
             && \array_key_exists($config['type'], $endpoints)
diff --git a/src/Capacity/Upsert.php b/src/Capacity/Upsert.php
index 17e7ed3..c524cc8 100644
--- a/src/Capacity/Upsert.php
+++ b/src/Capacity/Upsert.php
@@ -12,10 +12,7 @@ final class Upsert implements CapacityInterface
 {
     public function applies(array $config): bool
     {
-        $endpoints = array_merge(
-        Sylius\Validator\ExtractorConfigurationValidator::ADMIN_VALID_TYPES,
-            Sylius\Validator\ExtractorConfigurationValidator::SHOP_VALID_TYPES,
-        );
+        $endpoints = [...Sylius\Validator\ExtractorConfigurationValidator::ADMIN_VALID_TYPES, ...Sylius\Validator\ExtractorConfigurationValidator::SHOP_VALID_TYPES];
 
         return isset($config['type'])
             && \array_key_exists($config['type'], $endpoints)
diff --git a/src/Configuration/Client.php b/src/Configuration/Client.php
index 7ddbfc4..18c71bd 100644
--- a/src/Configuration/Client.php
+++ b/src/Configuration/Client.php
@@ -18,21 +18,15 @@ public function getConfigTreeBuilder(): \Symfony\Component\Config\Definition\Bui
         /* @phpstan-ignore-next-line */
         $builder->getRootNode()
             ->validate()
-                ->ifTrue(function ($v) {
-                    return !empty($v['token']) && (!empty($v['username']) || !empty($v['password']));
-                })
+                ->ifTrue(fn($v) => !empty($v['token']) && (!empty($v['username']) || !empty($v['password'])))
                 ->thenInvalid('You cannot specify both a token and a username/password combination.')
             ->end()
             ->validate()
-                ->ifTrue(function ($v) {
-                    return (!empty($v['username']) && empty($v['password'])) || (empty($v['username']) && !empty($v['password']));
-                })
+                ->ifTrue(fn($v) => (!empty($v['username']) && empty($v['password'])) || (empty($v['username']) && !empty($v['password'])))
                 ->thenInvalid('Both username and password must be defined together.')
             ->end()
             ->validate()
-                ->ifTrue(function ($v) {
-                     return empty($v['token']) && (empty($v['username']) || empty($v['password']));
-                })
+                ->ifTrue(fn($v) => empty($v['token']) && (empty($v['username']) || empty($v['password'])))
                 ->thenInvalid('You must specify either a token or a username and password combination.')
             ->end()
             ->children()
diff --git a/src/Factory/Client.php b/src/Factory/Client.php
index 87c1cf6..4016b57 100644
--- a/src/Factory/Client.php
+++ b/src/Factory/Client.php
@@ -94,7 +94,7 @@ public function compile(array $config): Repository\Client
             $clientBuilder->withClientBuilder(
                 new Node\Expr\New_(
                     new Node\Name\FullyQualified(
-                        $this->type == Sylius\ApiType::ADMIN ? 'Diglin\\Sylius\\ApiClient\\SyliusAdminClientBuilder' : 'Diglin\\Sylius\\ApiClient\\SyliusShopClientBuilder'
+                        $this->type == Sylius\ApiType::ADMIN ? \Diglin\Sylius\ApiClient\SyliusAdminClientBuilder::class : \Diglin\Sylius\ApiClient\SyliusShopClientBuilder::class
                     ),
                 )
             );
diff --git a/src/Service.php b/src/Service.php
index 47c6938..f0289a2 100644
--- a/src/Service.php
+++ b/src/Service.php
@@ -93,7 +93,7 @@ public function compile(array $config): Factory\Repository\Extractor|Factory\Rep
                 $client = $clientFactory->compile($config['client']);
 
                 $extractorBuilder
-                    ->withClientType(ApiType::from($config['version']) == ApiType::ADMIN ? new Node\Name\FullyQualified(name: 'Diglin\\Sylius\\ApiClient\\SyliusAdminClientInterface') : new Node\Name\FullyQualified(name: 'Diglin\\Sylius\\ApiClient\\SyliusShopClientInterface'))
+                    ->withClientType(ApiType::from($config['version']) == ApiType::ADMIN ? new Node\Name\FullyQualified(name: \Diglin\Sylius\ApiClient\SyliusAdminClientInterface::class) : new Node\Name\FullyQualified(name: \Diglin\Sylius\ApiClient\SyliusShopClientInterface::class))
                     ->withClient($client->getBuilder()->getNode());
 
                 $extractor->merge($client);
@@ -109,7 +109,7 @@ public function compile(array $config): Factory\Repository\Extractor|Factory\Rep
                 $client = $clientFactory->compile($config['client']);
 
                 $loaderBuilder
-                    ->withClientType(ApiType::from($config['version']) == ApiType::ADMIN ? new Node\Name\FullyQualified(name: 'Diglin\\Sylius\\ApiClient\\SyliusAdminClientInterface') : new Node\Name\FullyQualified(name: 'Diglin\\Sylius\\ApiClient\\SyliusShopClientInterface'))
+                    ->withClientType(ApiType::from($config['version']) == ApiType::ADMIN ? new Node\Name\FullyQualified(name: \Diglin\Sylius\ApiClient\SyliusAdminClientInterface::class) : new Node\Name\FullyQualified(name: \Diglin\Sylius\ApiClient\SyliusShopClientInterface::class))
                     ->withClient($client->getBuilder()->getNode());
 
                 $loader->merge($client);
diff --git a/src/Validator/ExtractorConfigurationValidator.php b/src/Validator/ExtractorConfigurationValidator.php
index 7919040..f1ccb94 100644
--- a/src/Validator/ExtractorConfigurationValidator.php
+++ b/src/Validator/ExtractorConfigurationValidator.php
@@ -8,7 +8,7 @@
 
 class ExtractorConfigurationValidator
 {
-    public const ADMIN_VALID_TYPES = [
+    final public const ADMIN_VALID_TYPES = [
         'address' => [
             'get',
         ],
@@ -167,7 +167,7 @@ class ExtractorConfigurationValidator
         ],
     ];
 
-    public const SHOP_VALID_TYPES = [
+    final public const SHOP_VALID_TYPES = [
         'address' => [
             'all',
             'get',
diff --git a/src/Validator/LoaderConfigurationValidator.php b/src/Validator/LoaderConfigurationValidator.php
index 2ac6132..563e009 100644
--- a/src/Validator/LoaderConfigurationValidator.php
+++ b/src/Validator/LoaderConfigurationValidator.php
@@ -8,7 +8,7 @@
 
 class LoaderConfigurationValidator
 {
-    public const ADMIN_VALID_TYPES = [
+    final public const ADMIN_VALID_TYPES = [
         'address' => [
             'create',
             'delete',
@@ -157,7 +157,7 @@ class LoaderConfigurationValidator
         ],
     ];
 
-    public const SHOP_VALID_TYPES = [
+    final public const SHOP_VALID_TYPES = [
         'address' => [
             'create',
             'delete',